Locking device



June 10, 1941. A, G. F. WALLGREN 2,244,930

LOCKING DEVICE Filed July 15, 1957 I INVENTOR flm, MM M Q BY f.

Mfu r Patented June 10, 1941 UNITED STATES PATENT OFFICE Sweden,

Redskapsfabrik Nya A. a corporation of Sweden Application July 15, 1937, Serial No. 153,719 In Sweden July 1'7, 1936 7 Claims.

My invention relates to locking devices and more particularly to devices for locking nuts and/or bolts in such a manner as to positively prevent relative rotation taking place between the nut or bolt and the member which is bolted thereby. Another object of my invention is the provision of such a device as a unitary structure. Further objects and advantages of my invention will be apparent from the following description considered in connection with the accompanying drawing, which forms a part of this specifica tion and of which:

Fig. 1. is an end view of a device embodying my invention;

Fig. 2 is a side view, partially in cross-section on the lines 2-2 of Fig. 1;

Fig. 3 is an enlarged view of a portion of the device shown in Figs. 1 and 2;

Fig. 4 is a side view of another embodiment of my invention;

Fig. 5 is an end view of the device shown in Fig. 4;

Fig. 6 is a cross-sectional view of a third embodiment of my invention and is taken on the line 6--6 of Fig. 7

Fig. 7 is a top view of the device shown in Fig. 6; and

Fig. 8 is a cross-sectional view taken on the line 8-8 of Fig. 7.

Referring more particularly to Figs. 1 through 3, reference character I designates a nut adapted to be threaded on a bolt I I which passes through a member I2. Disposed between nut I0 and member I2 is a locking element I3 which constitutes an annular ring provided with one or more ridge-like projections I4. Preferably, there are a plurality of projections which extend in a radial direction and are distributed equidistantly around the circumference of the element. The projections are made of comparatively hard material and, for instance, may be case-hardened. Recesses I are formed on either side of projections I4. The outer surface of element I3 is formed with flat surfaces and may be hexagonal.

Disposed between nut III and element I3 is a locking washer I6, the inner edge of which is formed as a circular channel I! extending around the inner edge of element I3. Thus, element I3 and washer I6 are rotatably connected to each other. If desired, washer I6 may be rigidly secured to nut III, as by spot-welding, although this is not necessary. The advantage of connecting the washer and nut together is that there results assignor to Liljeqvist Sfigblads-Och 13., Eskilstuna, Sweden,

a unitary structure consisting of the nut, the washer and the locking element I3.

When the nut I0 is rotated relative to the bolt II in the pro-per direction, it advances toward the member I2 and the projections I4, being of hard material, penetrate the surface of the member I2 as is shown particularly in Fig. 3. The recesses I5 on either side of projections I4 receive the material of member I2 which is displaced because of the penetration. The result is that relative rotation between the element I3 and the member I2 is positively prevented. After the nut has been tightened sufficiently, certain portions I8 of the outeredge of washer I6 are bent over so as to engage the fiat surfaces of element I3, thus preventing relative rotation between the element and the Washer. If the washer is rigidly secured to the nut Ill, the nut is hence locked against rotation with respect to both the locking element I3 and the member I2. If the washer and nut are not secured toether, other portions I9 of the washer may be bent so as to engage the flat surfaces of the nut, thus preventing relative rotation between the nut and the washer.

In the arrangement shown in Figs. 4 and 5, the

locking is between a round-headed screw 20 and the member I2 through which the screw extends. The construction of the locking element I3 and washer I6 is the same as that described in connection with the first embodiment. The head of screw 20 is formed with a flat surface 2I with which may be engaged the bent-over portion I9 of the washer.

When the screw is tightened, the projections I4 penetrate the surface of the member I2, thus locking element I3 against rotation with respect to member I2. Thereafter, the washer I6 is bent so as to engage the flat surfaces formed on element I3 and on screw 20, whereupon rotation between the screw and member I2 is positively prevented.

In the embodiment shown in Figs. 6 through 8, the locking is effected between the conical head 25 of a countersunk screw 26 and the conical surface 2! of the recess in the member I2 which re- I ceives the head 25. In this embodiment there is provided a conical locking element 30, the lateral i'ace 30w of which is made hexagonal. This element is provided with a plurality of hardened projections 3| which are adapted to penetrate into the conical surface 21 formed in member l2. Disposed between locking element 30 and the head 25 is a generally conical washer 32. After the bolt has been tightened and the projections understood that this has been done for purposes.

of illustration only and that further modifications fall within its scope, which" is to be limitedj'onl'y by the appended claims.

What I claim is:

1. In a device for locking two members against relative rotation, a locking element adapted tobe disposed between said members and being formed with a projection for engaging one of the members to thereby prevent relative rotation between said element and said one of said members, a lock washer adapted to be disposed between said element and the other of said members, said Washer being rotatably and permanently connected to said element and, being deformable to prevent rotation relative to said element, and

means for preventing relative rotation between said washerv and the other of said members,

2. In a device for locking two members against relative rotation, a locking element adapted to be disposed between said members and being formed with a projection for engaging one of the members to thereby prevent relative rotation between said element and said one of said members, and a lock washer adapted to be disposed between said element and the other of said members, said washer having a flange cooperating with a cir-- cular edge of said element for rotatably connecting the washer and element together, said washer being deformable to prevent rotation relative to said element and relative to the other of said elements 3. In a device for locking two members against relative rotation, a locking element adapted. to be disposed between said members and. being formed with a projection for engaging one'of the members to thereby prevent relative. rotation between saidelement and saidone of said members, and a lock washer rigidly secured tothe other of said members and rotatablyconnected to said element, said, washer being deformable intoengagement with said element to prevent rotation of the washer relative tosaid, element;

ment and the other of said members being formed with flattened surfaces and said washer beingt'deformable: to engage said surfaces to prevent relative rotation between the element and thewasher and between the washer and said other member.

51I-na device for locking a generally round headed screw against relative rotation with respect to a member, a locking element adapted to. be disposed between said member and the head of said screw and. being formed with aprojection for engaging said member,. said round head being formed with a. flattened portion and said locking element being formed with. a. fiat surface, and a washer between said head and said element, said washer being rotatably and permanently secured to said element and being deformable to engage said flattened portion and said flat surface.

6. In a device for locking 3. conically headed screw against rotation with respect to a member formed with a conical recess for receiving said head, a conical locking element disposed be,- tween the head and the surface of the recess and formed with a projection adapted to penetrate said surface, and a conical locking washer between said head and said element, saidwasher being rotatably and permanently secured. to said element and being deformablevto engage flattened surfaces on said head and said element.

7. In a device for locking two members against relative rotation, a locking element adapted to be disposed between said members and being formed with a plurality of e ui-distantly spaced projections for engaging one of the ,members, and means rotatably and permanently connected to said element and deformable to lock said element and the other of said members. against relative rotation.

AUGUST GUNNAR FERDINAND WALLGREN. 

